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Using (v) of Basic Formulae

Let 4	11	= a and	15	= b.
	15		71

∴ Expression
= (a + b)² – (a – b)²
= (a² + b² + 2ab) – (a² + b² – 2ab) = 4ab

= 4 × 4	11	×	15	= 4 ×	71	×	15	= 4
	15		71		15		71

	4	11	+	15		²	−		4	11	−	15		²	is equal to :
		15		71						15		71